Wireless Access Node Filter Bank Minimization
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Solution Overview
Problem
Wireless mesh networks face interference issues that reduce maximum throughput and increase hardware costs due to self-interference and adjacent channel signal power, despite efforts to allocate non-overlapping frequency spectra, and existing filtering solutions are costly and inefficient.
Innovation Solution
A wireless access node with a first and second radio, each operable on multiple transmission channels, utilizing a filter bank with fewer filters than channels to filter transmit/receive signals, allowing reversible communication modes and optimized channel filtering to minimize interference and hardware costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If filtering is included within radios of the access node to reduce interference from neighboring channels, then interference is reduced, but hardware cost increases
Solution Approach 1:
The patent divides the filtering function into separate filter banks associated with different radios rather than integrating all filters into a single expensive filtering system. Each radio has its own filter bank with fewer filters, reducing overall hardware cost while maintaining interference reduction capability through distributed filtering.
Solution Approach 2:
The patent applies partial filtering by using fewer filters than the total number of channels. Instead of implementing a complete filter for every channel, the system uses a reduced set of filters that provide sufficient interference reduction for the given network conditions, balancing performance and cost.
2Productivity
If full duplex transceivers are used to transmit and receive at the same time, then throughput is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements dynamic switching between half-duplex modes for different radios based on network conditions and traffic requirements. The system can flexibly configure which radios operate in half-duplex mode to maximize throughput while avoiding the complexity of full-duplex transceivers across all radios.
Solution Approach 2:
The patent applies different operational modes to different radios within the access node. Some radios can operate in full-duplex mode when needed for high throughput, while others operate in half-duplex mode to reduce complexity, allowing each radio to have the quality appropriate to its specific function and network conditions.
3Adaptability or versatility
If omni-directional antennas are used to allow relative orientations to change, then adaptability is improved, but interference control becomes more difficult
Solution Approach 1:
The patent incorporates feedback mechanisms that monitor interference levels and network conditions, allowing the system to dynamically adjust filtering parameters, channel selections, and radio operational modes. This feedback enables the system to maintain adaptability with omni-directional antennas while compensating for increased interference through intelligent control.
Solution Approach 2:
The patent changes operational parameters such as filtering thresholds, channel allocation, and radio modes based on the interference environment. By dynamically adjusting these parameters, the system maintains the flexibility of omni-directional antennas while managing interference through parameter optimization rather than physical directional control.
Data Source
AI summary
A wireless access node includes a first radio operable to transmit/receive on one of at least N transmission channels. A second radio is operable to transmit/receive on another one of the at least N transmission channels. A first filter bank, of less than N filters, filters a first transmit/receive signal of the first radio. A second filter bank, of less than N filters, filters a second transmit/receive signal of the second radio. Generally, N is greater than 2.